Can you prove intent? You've gotten unbiased opinions on here before you revealed your personal connection to this incident. If different folks are debating whether the play was even a foul, how do you plan on proving that this was some elaborate scheme to injure the player? Or how can you hold others responsible for a play that knowledgeable soccer folks have said that it's not a dirty play?
Maybe your personal connection is affecting your objectivity, but if you think this hit merits all this legal action, then maybe you need to not continue putting the kid in the soccer field. It sucks that the player suffered a concussion because of it, but in no way does that mean that everyone should be sued & charged. If that's the case, I need to find an attorney to help me sue a bunch of folks & Adidas for the concussion I suffered my junior yr due to the ball hitting my head. Anyone have Saul Goodman's number?